Cord plug or connecter



Sept. 15. 1925. 1,553,801

A. J. CARTER CORD PLUG OR CONNECTER Filed April 26, 192g In 1/327 t0):

Patented'Sept. 15, 1925.

UNITED STATES PATENT OFFICE.

ALVA J. CARTER, OF CHICAGO, ILLINOIS, ASSIGROB, BY DIRECT AND MESNE ASSIGN- lrmrrs, or ONE-HALF roc nrnn nAmo COMPANY, or CHICAGO, ILLINOIS, A .conroaArIon or rumors, AND ONE-HALF r YAXLEY MAnUr c'runme comrm, or 011mm, minors, A coaronA'rIon or ILLINOIS.

com) race on. OONNEOTER.

To all whom it may com-em: Be it known that I, ALVA J. CARTER, a citizen'of the United States, residi at Chicago, in the county of Cook and tate of IlllIlOlS, have invented certain new and use- Y ful'Improvements in Cord Plugs 01' Connecters, of which the following is a specification, reference being had to the accompanying drawings, and to the reference characters marked thereon, which form a part of this specification.

This invention relates to cord plugs or connecters for establishin electrica connections between flexible, e ectrical, insulated conductors and the springs or contacts of a switchboard or other apparatus.

The plugs commonly in use on switchboards of telephone exchanges have certain limitations when used in radio. service to connect the head receivers to the radio set, and the principal object of my invention is to provide a-simple construction of cord plug especially desi ned for efiective use in- I'fldlO apparatus, an at. the same timeavailable for use in telephone switchboards.

. Another object is to so construct the lug connecter as to permit the various km s of cord terminals now in use, flats ade clips, 1

pin, tinsel and wire, to be readi y secured thereto and without soldering.

Another object of my invention is'to con- .struct a plug connector in such manner as to provide connections for the cord conductors of two head set telephones, thus avoidin the expense of an extra plu and jack; ese

and other advantages W1 1 be manifest as I proceed with this-specification. 1

In that form in which I-havechosen' to v embody my invention, as illustrated in the accompanying drawings,

' Fig. 1 is a side elevation, the sheath being shown in longitudinal section. v

. i a fierent position.-

view-of the same, on an enlarged scale, with flexible conductors attached,the section being in Fig.2, looking in thedireotion indicated by the arrows. p I

Fig. 4 is a transverse, vertical, sectional view, the section being taken in the plane of Fis 2 is a similar view, showing the parts Fig. 3 is a longitudinal, vertical, seem the plane of the dotted line 3-3 ofthe dotted line 44 of Fig. 3, looking in the direction indicated by the arrows;

Figs. 5 and 6 are perspective views of the metal strips, enlarged, to which the flexible conductors are secured.

In said drawings, the plug, as a whole, is

indicated at A. It comprises a metallic peg or plug proper, 1, having an enlarged base 2. A tubular or hollow sheath 3, of rubber or similar material, surrounds a portion of the base 2 and encloses the parts hereinafter described. The base 2 is exteriorly screw threaded, as shown at 4, whereby the interiorly screw threadedend 5 of the sheath 3 'minates in a shouldered flange 9. The end of the stem 8 is screw threaded at 10. The

plug 1 is centrally and longitudinally bored so that the stem 8 may extend therethrough and the latter is insulated from the plug by a flanged insulating bushing 11, the flange 12' of which is set against the flan e 9, thus insulating it from the end of the p ug sleeve lows: The strip C is bent between its ends to form-a fastening section 13, an inwardly turned disc section 14 and an intermediate section 15, the latter being parallel with but ina different plane from the section 13. An

aperture 16' extends through the section 14 disc' section 18' is not completely circular,

being cutaway at '20, as s own in Fig. 5. Its disc section 18 is likewise centrally aperturedv and interiorly screw threaded at 21 to fit over and enga e the screw threaded end of the stem '8. U pon the stem 8 and intermediate the discs 141-18, is an insulating The conductors B, B, are secured to terminal metallic strips C, D, located within "the sheath. These strips are, made' as folwasher 22 provided with a segmental flange- 23, the latter beingpositioned so as to be interposed between the cut away part 2001? the strip D and the section 15 of the strip 0.

The plug 1 and the strip C are electrically connected, and the strip D, stem 8 and tip 7 are electrically connected. The strips C and D are held firmly upon the base 2 of the plug 1, but there is complete insulation between the plug 1 and strip G on the one hand and the strip D, stem 8 and tip 7 on the other hand.

It will be noticed that the sections 16 and 17 of the strips C, D, when assembled as shown in Fig. 2, are in parallel relation and that by reason of the shoulders '0 and (Z, a relatively large space is provided in which to house the means for attaching the conductor ends B, B, to the strips C and D. and at the same time enable me to use a sheath 3 of relatively small diameter.

The outer face of the section 13 of the strips C is provided with longitudinally arranged grooves 24 extending from the free end almost to the shoulder a. An interiorly screw threaded aperture 25 extends through the section 13, and is adapted to be engaged by the holding screw 26, whose head overlies both grooves.

The section 17 of strip D is similarly grooved at 27, and also provided with a screw threaded aperture 28 to receive the screw 29 whose head overlies both grooves.

The flexible cord conductors will be. provided with proper means for attachment to the plug strips C and D. In the drawing, I have shown said means as including wires or pins, of a size adapted to rest in the grooves 24, 27, and when so positioned, the attachment is completed by screwing down the screws 26, 29. It will be noted that the length of the grooves 24: and 27 afi'ord an especially good contact surface for the entire length of the wires or pins 30. It will also be observed that the four groove arrangement shown not only provides for four pin cord terminals at the same time, but provides a more perfect alignment at all times and thus two terminals may be secured by a single screw.

It will be manifest also that if desired,

these terminals may be soldered to the strips C and D and that this arrangement of the strip permits of any of the conventional cord terminals being used in my plug.

The parts are few, easy to assemble, not easy to get out of order, relatively cheap to manufacture, and have proven exceedingly eflicient in use.

I claim as my invention:

1. In a switch plug, a hollow metallic peg having an enlarged base, an insulating bushing extending through said peg, a pair of sheet metal contact members each including a body portion and an end portion bent at right angles to its body portion, said members being disposed with their right angularly bent end portions in overlying relation to one another, an insulating washer between said right angularly bent end portions, and a screw passing through said insulating bushing and said right angularly bent end portions clamping one of the latter against the base of said peg and the other against said insulating washer, the right angularly bent end portion of one of said members having a flattened edge cooperating with the body portion of the other member to prevent relative rotation of the members about said screw.

2. In a switch plug, a hollow metallic peg having an enlarged base, an insulating bushing extending through said peg, a pair of sheet metal contact members each including a body portion and an end portionbent at.

right angles to its body portion, said members being disposed with their right angularly bent end portions in overlying relation to one another, an insulating washer between said right angularly bent end portions, and a screw passing through said insulating bushing and said right angularly bent end portions clamping one of the latter against the base of said peg and the other against said insulating washer, the right angularly bent end portion of one of said members having a flattened edge cooperating with the body portion of the other member to prevent relative rotation of the members about said screw, and the body portions of said mem-' ALVA J. CARTER. 

